A group of Hippies talk and smoke marijuana outside their camp at the Isle of Wight pop festival on Aug. 1, 1969.

A group of Hippies talk and smoke marijuana outside their camp at the Isle of Wight pop festival on Aug. 1, 1969.

Photo: Evening Standard, Getty Images

A group of Hippies talk and smoke marijuana outside their camp at... Photo-3853912.53507 - seattlepi.com

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A poster with a quotation in favor of marijuana use by poet Allen Ginsberg hangs on a wall on Sept. 25, 1969.

A poster with a quotation in favor of marijuana use by poet Allen Ginsberg hangs on a wall on Sept. 25, 1969.

Photo: Sydney O'Meara, Getty Images

A poster with a quotation in favor of marijuana use by poet Allen... Photo-3853918.53507 - seattlepi.com

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American pediatrician, psychiatrist and pacifist Dr. Benjamin Spock addresses an audience during his election campaign as candidate for the American presidency in 1972, running against George McGovern and Richard Nixon. His platform included withdrawal of all American troops from everywhere, legalized abortion and marijuana, and amnesty for draft dodgers. less

American pediatrician, psychiatrist and pacifist Dr. Benjamin Spock addresses an audience during his election campaign as candidate for the American presidency in 1972, running against George McGovern and ... more

American rapper Snoop Dogg is escorted in handcuffs by two police officers following his arrest on charges of suspicion of possession of marijuana, circa 1995.

American rapper Snoop Dogg is escorted in handcuffs by two police officers following his arrest on charges of suspicion of possession of marijuana, circa 1995.

Photo: Hulton Archive, Getty Images

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Police constable Denver Sas smokes a water pipe known as a "hubbly bubbly" filled with marijuana on May 11, 1995 before the start of a protest march to legalize the substance in Cape Town, South Africa.

Police constable Denver Sas smokes a water pipe known as a "hubbly bubbly" filled with marijuana on May 11, 1995 before the start of a protest march to legalize the substance in Cape Town, South Africa.

Members of the "Mars Work Force" anti-narcotics special brigade burn marijuana on Aug. 14, 1995 in Sinaloa State in western Mexico.

Members of the "Mars Work Force" anti-narcotics special brigade burn marijuana on Aug. 14, 1995 in Sinaloa State in western Mexico.

Photo: MATIAS RECART, AFP/Getty Images

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An unidentified Canabis Buyers' Club customer (right) lights up a marijuana cigarette for Dennis Person (behind bar), the establishment's director, on May 2, 1996 in San Francisco. Buyers suffering from AIDS, cancer or conditions with symptoms that marijuana is know to alleviate can purchase the outlawed drug with a doctor's note. In the foreground is a bowl of marijuana and marijuana brownies. less

An unidentified Canabis Buyers' Club customer (right) lights up a marijuana cigarette for Dennis Person (behind bar), the establishment's director, on May 2, 1996 in San Francisco. Buyers suffering from AIDS, ... more

Cheryl Miller from Silverton, N.J., severely disabled by Multiple Sclerosis, is given marijuana to chew by her husband Jim as they participate in a protest against anti-medicinal marijuana legislation, in the doorway of the office of U.S. Rep. Jim Rogan, R-CA, on March 30, 1998, in Washington, D.C. Rogan's office was targeted because he voted for favorable legislation in 1995, citing that a relative found relief by using the drug, and then voted for a House resolution proclaiming opposition to medicinal use of marijuana. Miller was arrested for marijuana possession. less

Cheryl Miller from Silverton, N.J., severely disabled by Multiple Sclerosis, is given marijuana to chew by her husband Jim as they participate in a protest against anti-medicinal marijuana legislation, in the ... more

A Hong Kong woman looks at the display window of British-based cosmetic outlet The Body Shop decorated with a cut-out picture of a cannabis leaf on November 2, 1998. Hong Kong narcotics bureau investigated a range of hemp-based products by the cosmetics company to test whether they contravene drug laws. less

A Hong Kong woman looks at the display window of British-based cosmetic outlet The Body Shop decorated with a cut-out picture of a cannabis leaf on November 2, 1998. Hong Kong narcotics bureau investigated a ... more

Mother-of-five Sonia Webb campaigns for more relaxed drug laws on the "Cannabus" carrying a 12-metre-long replica of a marijuana joint outside the New South Wales State Parliament at the start of the Drug Summit in Sydney on May 17, 1999. less

Mother-of-five Sonia Webb campaigns for more relaxed drug laws on the "Cannabus" carrying a 12-metre-long replica of a marijuana joint outside the New South Wales State Parliament at the start of the Drug ... more

Aaron Sorkin, creator of "The West Wing," looks at his attorney, Steve Sitkoff, during his arraignment May 2, 2001 at the Superior Court in Burbank, Calif., on charges of possession of illegal hallucinogenic mushrooms, rock cocaine and marijuana. Sorkin was arrested April 15, 2001 at Burbank Airport after security officers found a small bag in his carry-on luggage containing paper bundles suspected of containing drugs. less

Aaron Sorkin, creator of "The West Wing," looks at his attorney, Steve Sitkoff, during his arraignment May 2, 2001 at the Superior Court in Burbank, Calif., on charges of possession of illegal hallucinogenic ... more

Photo: Pool, Getty Images

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Tania Gladstone tries out a hemp pretzel as Sintra Howell looks on at a stand promoting hemp products December 4, 2001 in New York City. The D.E.A. recently banned all hemp food products that contain THC, the active ingredient in marijuana. less

Tania Gladstone tries out a hemp pretzel as Sintra Howell looks on at a stand promoting hemp products December 4, 2001 in New York City. The D.E.A. recently banned all hemp food products that contain THC, the ... more

An assistant studies marijuana/cannabis leaves in the Maripharma Laboratory February 15, 2002 in Rotterdam, The Netherlands. The Dutch government is the first in the world to officially approve the cultivation and sale of cannabis products to pharmacies for medical purposes. less

An assistant studies marijuana/cannabis leaves in the Maripharma Laboratory February 15, 2002 in Rotterdam, The Netherlands. The Dutch government is the first in the world to officially approve the cultivation ... more

The norml.org web site posts an ad created by the National Organization for the Reform of Marijuana Laws (NORML) featuring New York Mayor Michael Bloomberg. Bloomberg found himself the poster boy for an ad campaign to legalize marijuana in a full-page spread in the New York Times April 9, 2002. less

The norml.org web site posts an ad created by the National Organization for the Reform of Marijuana Laws (NORML) featuring New York Mayor Michael Bloomberg. Bloomberg found himself the poster boy for an ad ... more

Photo: Getty Images

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David Crosby, of Crosby, Stills and Nash, performs May 3, 2003 during the Music Midtown concert in Atlanta, Georgia. Crosby was arrested on marijuana and guns possession charges March 6, 2004 in New York City.

David Crosby, of Crosby, Stills and Nash, performs May 3, 2003 during the Music Midtown concert in Atlanta, Georgia. Crosby was arrested on marijuana and guns possession charges March 6, 2004 in New York City.

Proponents of medical marijuana hold signs outside of the U.S. Supreme Court November 29, 2004 in Washington, D.C. The court heard arguments over whether the Controlled Substance Act of 1970 is unconstitutional as it applies to the right to cultivate and possess cannabis to treat medical conditions as recommended by a medical doctor. The court upheld the federal government's right to ban the drug. less

Proponents of medical marijuana hold signs outside of the U.S. Supreme Court November 29, 2004 in Washington, D.C. The court heard arguments over whether the Controlled Substance Act of 1970 is unconstitutional ... more

Actor John Kassir , Andy Fickman, director and Matt Blank, CEO and chairman of Showtime pose at the premiere of Showtime's "Reefer Madness" held at the regent Showcase Cinemas on April 5, 2005 in Hollywood, Calif. less

Actor John Kassir , Andy Fickman, director and Matt Blank, CEO and chairman of Showtime pose at the premiere of Showtime's "Reefer Madness" held at the regent Showcase Cinemas on April 5, 2005 in Hollywood, ... more

In this handout from Drug Enforcement Administration, cross-border tunnel between between the Lynden, WA and Aldergrove, B.C., Canada, is seen July 21, 2005. So-called "B.C. Bud" is commonly smuggled across the border. less

In this handout from Drug Enforcement Administration, cross-border tunnel between between the Lynden, WA and Aldergrove, B.C., Canada, is seen July 21, 2005. So-called "B.C. Bud" is commonly smuggled across ... more

"Prince of Pot" Marc Emery addresses a crowd of four hundred that attended an anti-extradition rally held for him in front of the U.S. Consulate on September 10, 2005 in Vancouver, B.C., Canada. Emery, leader of the British Columbia Marijuana Party, faced extradition for selling marijuana seeds on the internet. less

"Prince of Pot" Marc Emery addresses a crowd of four hundred that attended an anti-extradition rally held for him in front of the U.S. Consulate on September 10, 2005 in Vancouver, B.C., Canada. Emery, leader ... more

Alternative Herbal Health Services worker Jason Beck packages medical marijuana April 24, 2006 in San Francisco, after the Food and Drug Administration issued a statement declaring that there is no scientific evidence supporting use of the drug for medical treatment. less

Alternative Herbal Health Services worker Jason Beck packages medical marijuana April 24, 2006 in San Francisco, after the Food and Drug Administration issued a statement declaring that there is no scientific ... more